commit 0ce6be4a5ae2f4d255894f2d39fd0d0e1c35c9db
Author: Joe Ardent <code@ardent.nebcorp.com>
Date:   Thu Sep 25 17:10:47 2025 -0700

    draws a single steerable moving triangle

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..16a0ecd
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..1aadf18
--- /dev/null
+++ b/Cargo.toml
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+[package]
+name = "joids"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+macroquad = "0.4"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..a51aa82
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,73 @@
+use macroquad::prelude::*;
+
+const JOID_LEN: f32 = 50.;
+const JOID_WIDTH: f32 = 30.;
+
+#[derive(Debug, Default, Clone)]
+struct Joid {
+    pub pos: Vec2,
+    pub speed: f32,
+    pub rot: f32,
+    pub id: u32,
+}
+
+impl Joid {
+    pub fn tpoints(&self) -> (Vec2, Vec2, Vec2) {
+        let nose = Vec2::NEG_Y * (JOID_LEN * 0.5);
+        let left = Vec2::Y * JOID_LEN * 0.5 + Vec2::NEG_X * JOID_WIDTH * 0.5;
+        let right = Vec2::Y * JOID_LEN * 0.5 + Vec2::X * JOID_WIDTH * 0.5;
+        let rot = Mat2::from_angle(self.rot.to_radians());
+        (
+            self.pos + (rot * nose),
+            self.pos + (rot * left),
+            self.pos + (rot * right),
+        )
+    }
+}
+
+#[macroquad::main("joe's boids")]
+async fn main() {
+    let mut joid = Joid::default();
+
+    let x = screen_width() / 2.0;
+    let y = screen_height() / 2.0;
+    joid.pos = Vec2::new(x, y);
+
+    loop {
+        let mut rot = joid.rot;
+        if is_key_down(KeyCode::Left) {
+            rot -= 2.0;
+            if rot < 0.0 {
+                rot += 360.0;
+            }
+            joid.rot = rot;
+        }
+        if is_key_down(KeyCode::Right) {
+            rot += 2.0;
+            joid.rot = rot % 360.0;
+        }
+
+        if is_key_down(KeyCode::Up) {
+            let speed = (joid.speed + 0.5).min(10.0);
+            joid.speed = speed;
+        }
+
+        if is_key_down(KeyCode::Down) {
+            let speed = (joid.speed - 0.5).max(0.0);
+            joid.speed = speed;
+        }
+
+        if is_key_down(KeyCode::Escape) {
+            break;
+        }
+
+        let (nose, left, right) = joid.tpoints();
+
+        draw_triangle(nose, left, right, Color::from_hex(0xffffff));
+        let acc = (nose - joid.pos).normalize() * joid.speed;
+
+        joid.pos += acc;
+
+        next_frame().await;
+    }
+}